Canon Speedlite 430EX III-RT - Manual (Page 71)

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5
Wireless Flash Photography:
Optical Transmission
This chapter describes wireless flash shooting using the
optical transmission wireless slave function.
For the accessories required for optical transmission
wireless shooting, see the system map (p.90).
When the camera’s shooting mode is set to a fully automatic
mode or a Basic Zone mode, the operations in this chapter are
not available. Set the camera’s shooting mode to <
d >, < s >,
< f >, < a >, or < F > (Creative Zone mode).
The optical transmission wireless slave function is available
with both Speedlite 430EX III-RT and Speedlite 430EX III.
You can wirelessly control a 430EX III-RT/430EX III set as an
optical transmission wireless slave unit using a device
equipped with the optical transmission wireless master
function (p.91).
The device equipped with the optical transmission wireless
master function is called the “master”, and a 430EX III-RT/
430EX III that is controlled wirelessly is called a “slave”.